> MQ135 is mainly used to detect the concentration of carbon dioxide, alcohol, benzene, NOx, ammonia and other gases in the air.

The MQ135 board has 4 pins: Vcc (5v), GND, A0 (Analog voltage), and D0 (digital signal). It has several components, including the MQ135 sensor, a power LED, an alarm LED, a variable resistor to adjust ...

IoT Project – MQ135 Gas Sensor 🌫️ As part of our IoT project, we worked on an air quality monitoring system using the MQ135 gas sensor. This project helped us understand how IoT can be used to ...